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If I have a fully blue image. (Applied solid blue layer on "colour" layer mode) and I want to make the image more iridescent by randomly making some shades different hues of blue how could I do this? For example adding a "brightness and contrast" layer above it makes it change to different hues of blue but not as pronounced or diverse as I want. Thanks and here is an example of iridescent

example

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    Can you link a picture from the Web that you deem "iridescent"? – bukwyrm May 30 '18 at 7:45
  • to clarify I want to shift all colours past a certain hue to cyan, and all colours over a certain hue to indigo. and keep the middle cobalt. – LDR May 30 '18 at 7:53
  • I guess your method, or any method involving conflating brightness and hue (e.g. Curves) can approximate an iridescent effect. But note that true iridescence (en.wikipedia.org/wiki/Iridescence) has the hue shift with illumination/viewing angle, and thus would need a 3D model to work from, even for a static 2D image. The brightness of any given pixel (that you work with for your effect) is not directly and solely linked to angle-of-material. – bukwyrm May 30 '18 at 8:21
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You could fake it a bit in Camera Raw; shifting aquas, blue & purples in different directions.

enter image description here

I've pushed this way too far just as an example - & the original image was tiny, so it looks a bit rough.
You can actually keep repeating this action to push things further, though it will get a tad "sci-fi" after a while.

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  • how do you get regular images into camera raw? – LDR May 30 '18 at 15:51
  • Filter Menu/ Camera RAW Filter... works on pretty much anything [though I've never tested anything other than RGB] – Tetsujin May 30 '18 at 15:52
  • I found it just as you commented. pretty cool thanks. – LDR May 30 '18 at 15:54
  • Thanks, this is what I ended up doing, it gave the best result. Once was enough. – LDR May 30 '18 at 22:48
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I figured it out but I don't mind alternative methods either or if there are any downsides to what I did. I used "Color Range" from select to select the highlights, midtones and shadows and then applied a different blue "colourize" layer to each layer of the image and stacked them in the right order to get the best effect.

Edit: Ended up using the accepted answer's method.

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  • Can you add your own image result? Would be nice to see what you got with your method. – Luciano May 30 '18 at 8:45

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